﻿using System.IO.IsolatedStorage;
using System.Threading;
using System.Windows;
using System.Windows.Navigation;
using GroupChallengeWP7.Models;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;

namespace GroupChallengeWP7
{
    public partial class App : Application
    {
        /// <summary>
        /// Main page for other views to control such as move to other pivot control views.
        /// </summary>
        internal static MainPage TheMainPage = null;

        private Player _player;
        private Network _network;
        private GameState _gameState;

        /// <summary>
        /// Main view model instance.
        /// </summary>
        private MainViewModel _viewModel = null;

        public static MainViewModel ViewModel
        {
            get
            {
                return ((App)Application.Current)._viewModel;
            }
        }

        /// <summary>
        /// Provides easy access to the root frame of the Phone Application.
        /// </summary>
        /// <returns>The root frame of the Phone Application.</returns>
        public PhoneApplicationFrame RootFrame { get; private set; }

        /// <summary>
        /// Constructor for the Application object.
        /// </summary>
        public App()
        {
            // Global handler for uncaught exceptions. 
            UnhandledException += Application_UnhandledException;

            // Show graphics profiling information while debugging.
            if (System.Diagnostics.Debugger.IsAttached)
            {
                // Display the current frame rate counters
                Application.Current.Host.Settings.EnableFrameRateCounter = true;

                // Show the areas of the app that are being redrawn in each frame.
                //Application.Current.Host.Settings.EnableRedrawRegions = true;

                // Enable non-production analysis visualization mode, 
                // which shows areas of a page that are being GPU accelerated with a colored overlay.
                //Application.Current.Host.Settings.EnableCacheVisualization = true;
            }

            // Standard Silverlight initialization
            InitializeComponent();

            // Phone-specific initialization
            InitializePhoneApplication();
        }

        // Code to execute when the application is launching (eg, from Start)
        // This code will not execute when the application is reactivated
        private void Application_Launching(object sender, LaunchingEventArgs e)
        {
            InitializeModel();

            RestartServerUpdates();
        }

        // Code to execute when the application is activated (brought to foreground)
        // This code will ___NOT___ execute when the application is first launched
        private void Application_Activated(object sender, ActivatedEventArgs e)
        {
            InitializeModel();

            RestartServerUpdates();       //  Restart the thread that was killed on Deactivate

            resetEvent.Set();             // Put in set state.
        }

        // Code to execute when the application is deactivated (sent to background)
        // This code will not execute when the application is closing
        private void Application_Deactivated(object sender, DeactivatedEventArgs e)
        {
            SaveModel();
            resetEvent.Reset();             // Put in unset state.
        }

        // Code to execute when the application is closing (eg, user hit Back)
        // This code will not execute when the application is deactivated
        private void Application_Closing(object sender, ClosingEventArgs e)
        {
            SaveModel();
            resetEvent.Reset();             // Put in unset state.
        }

        // Code to execute if a navigation fails
        private void RootFrame_NavigationFailed(object sender, NavigationFailedEventArgs e)
        {
            if (System.Diagnostics.Debugger.IsAttached)
            {
                // A navigation has failed; break into the debugger
                System.Diagnostics.Debugger.Break();
            }
        }

        // Code to execute on Unhandled Exceptions
        private void Application_UnhandledException(object sender, ApplicationUnhandledExceptionEventArgs e)
        {
            if (System.Diagnostics.Debugger.IsAttached)
            {
                // An unhandled exception has occurred; break into the debugger
                System.Diagnostics.Debugger.Break();
            }
        }

        #region Phone application initialization

        private void InitializeModel()
        {
            // Ensure that application state is restored appropriately
            _player = new Player();
            _gameState = new GameState();
            _network = new Network(_gameState);

            IsolatedStorageSettings settings = IsolatedStorageSettings.ApplicationSettings;
            _player.LoadSettings(settings);
            _network.LoadSettings(settings);
            _gameState.LoadSettings(settings);

            _viewModel = new MainViewModel(_player, _network, _gameState);
        }

        private void SaveModel()
        {
            // Ensure that required application state is persisted here.
            IsolatedStorageSettings settings = IsolatedStorageSettings.ApplicationSettings;
            _network.SaveSettings(settings);
            _player.SaveSettings(settings);
            _gameState.SaveSettings(settings);
            settings.Save();
        }

        // Avoid double-initialization
        private bool phoneApplicationInitialized = false;

        // Do not add any additional code to this method
        private void InitializePhoneApplication()
        {
            if (phoneApplicationInitialized)
                return;

            // Create the frame but don't set it as RootVisual yet; this allows the splash
            // screen to remain active until the application is ready to render.
            RootFrame = new PhoneApplicationFrame();
            RootFrame.Navigated += CompleteInitializePhoneApplication;

            // Handle navigation failures
            RootFrame.NavigationFailed += RootFrame_NavigationFailed;

            // Ensure we don't initialize again
            phoneApplicationInitialized = true;
        }

        // Do not add any additional code to this method
        private void CompleteInitializePhoneApplication(object sender, NavigationEventArgs e)
        {
            // Set the root visual to allow the application to render
            if (RootVisual != RootFrame)
                RootVisual = RootFrame;

            // Remove this handler since it is no longer needed
            RootFrame.Navigated -= CompleteInitializePhoneApplication;
        }

        // Manual reset event in the running state initially
        private System.Threading.ManualResetEvent resetEvent = new System.Threading.ManualResetEvent(true);

        // Start the Group Challenge question and game state updates.
        internal void RestartServerUpdates()
        {
            // Start the background thread.
            ThreadStart threadStart = new ThreadStart(ThreadProc);
            Thread t = new Thread(threadStart);

            t.Name = "GameStateThread";
            t.IsBackground = true;
            t.Start();
        }

        // Background thread method to run.
        private void ThreadProc()
        {
            while (true)
            {
                // Block until in the running state
                resetEvent.WaitOne();

                PollServerForUpdate();

                // Still wait for a delay.
                System.Threading.Thread.Sleep(1500);
            }
        }

        // Thread to poll for game updates.
        private void PollServerForUpdate()
        {
            // Poll server if playing game with a nickname.
            if (null != ViewModel &&
                !string.IsNullOrEmpty(ViewModel.NickName))
            {
                // Get to the UI for updates.
                RootFrame.Dispatcher.BeginInvoke(() =>
                {
                    ViewModel.UpdateGameStats();
                });
            }
        }

        #endregion
    }
}